Warp drives. Artificial gravity. Terraforming planets. These concepts might sound as though they're ripped from the pages of science fiction, but they're the topic of serious scientific presentations at a symposium this weekend sponsored by DARPA, the Defense Advanced Research Projects Agency.
Called the 100-Year Starship Symposium, the public event will run Sept. 30 to Oct. 2 in Orlando, Fla. For three days, scientists from universities, NASA centers and private institutions will discuss far-out ideas for building a spaceship to visit another star.